Fix MakeAbilityCommand::getDefaultNamespace signature incompatibility

[retlehs]

Closes #3

Problem

MakeAbilityCommand::getDefaultNamespace declares a string type on the $rootNamespace parameter, but the parent Illuminate\Console\GeneratorCommand::getDefaultNamespace has no type hint. In PHP 8, adding a parameter type in a subclass is a covariance violation, resulting in:

Fatal error: Declaration of Roots\AcornAi\Console\Commands\MakeAbilityCommand::getDefaultNamespace(string $rootNamespace): string must be compatible with Illuminate\Console\GeneratorCommand::getDefaultNamespace($rootNamespace)

Fix

Remove the string type hint from the $rootNamespace parameter to match the parent signature. The return type string is kept as PHP allows narrowing return types in subclasses.

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